To answer your question, it is my thoughts that all Canadian Fords and Mercurys received these one piece hubcaps. These in turn were exported to New Zealand and Australia, being Commonwealth Countries. In Australia, all 1946 to 1948 Ford passenger cars, and all 1948 to 1956 Ford F series pickups had these one piece hubcaps. The Script on 1946 and 1947 Ford hubcaps were painted Red, while the 1948 Ford hubcaps were painted Blue. The same style hubcap with FORD in block letters was also fitted to the Ford Pickups from 1948, but the block letters were painted Red. These one piece hubcaps are superior to the USA styled 2 piece hubcaps, as they are full Stainless Steel and do not rust. I have seen some of the USA 2 piece hubcaps with rusted bands on the inside, making them useless. I believe that the Canadian 1942 Ford hubcaps were also made in one piece, but as this model is so rare in Australia, i have never seen one. In my Hubcap collection, my 1942 Ford Hubcap is of the two piece variety, however, I do have two 1941 Mercury hubcaps, one of each style. As you know, the 1940 Ford hubcap was one piece, and it seems that Ford in USA decided to make the 1941 hubcaps on two piece, as the price may have been cheaper?